抄録
Fretting fatigue characteristics of Ti-6Al-4V in the high cycle regime was investigated. The fretting fatigue limits of Ti-6Al-4V at 10^7cycles were σa=130MPa for stress ratio R=-1, 100MPa for R=0.5 and 80MPa for R=0.7 and those at 10^8cycles were σa=130MPa, 90MPa and 70MPa , respectively. It is found that the Goodman's relation can be applicable for the present material and under the present test conditions. From the SEM observations it is found that a fretting fatigue crack initiates in the very late stage of fatigue life. From the test results, even in the high cycle regime the specimens may fracture at the stress level lower than fatigue strength defined at 10^7 cycles. From the test results with various frequencies, no differences of fretting fatigue life was found between 30Hz and 300Hz.
